Volume 398 - The European Physical Society Conference on High Energy Physics (EPS-HEP2021) - T12: Detector R&D and Data Handling
Operation of the new CGEM Inner Tracker for the Upgrade of the BESIII Experiment
S. Gramigna*  on behalf of the CGEM-IT working group
*: corresponding author
Full text: pdf
Pre-published on: February 17, 2022
Published on: May 12, 2022
Abstract
A ten years extension of the data taking of BESIII experiment, recently approved, motivated an
upgrade program both for the leptonic collider BEPCII and for some of the sub-detectors of the
spectrometer. In particular, the current inner drift chamber is suffering from aging and the proposal
is to replace it with a detector based on cylindrical GEM technology. The CGEM detector is made
of three coaxial layers of triple GEM. The tracker is expected to restore the efficiency, to improve
the z determination and the secondary vertex position reconstruction with respect to the current
inner tracker, with a resolution of 130 μm in xy plane and better than 350 μm along the beam
direction. A cosmic telescope instrumented with two out of three layers is in operation in Beijing
since January 2020, remotely controlled by Italian groups due to the pandemic situation. In this
presentation, the general status of the project will be presented with a particular focus on the
preliminary results from the cosmic data taking and future plans.
DOI: https://doi.org/10.22323/1.398.0766
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